Water → 3-Chloro-12-cyclohexyl-5-[2-(piperidin-1-yl)ethyl]-5,6,7,12-tetrahydro-benzo[2,3]azepino[4,5-b]indole-9-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 3-chloro-12-cyclohexyl-5-[2-(piperidin-1-yl)ethyl]-5,6,7,12-tetrahydrobenzo[2,3]azepino[4,5-b]indole-9-carboxylate (309 mg, 0.579 mmol) in tetrahydrofuran (4 ml) and methanol (4 ml) was added 1N aqueous sodium hydroxide solution (2 ml), and the mixture was stirred at 70° C. for 2 hr. The mixture was allowed to cool to room temperature, 4N aqueous lithium hydroxide solution (2 ml) was added, and the mixture was stirred at 70° C. for 2 hr. The mixture was allowed to cool to room temperature, water (100 ml) was added, and the mixture was extracted with ethyl acetate (20 ml) and ether (10 ml). The aqueous layer was adjusted to pH 7 with 1N hydrochloric acid, and the precipitated solid was collected by filtration. The obtained solid was washed with water and dried in vacuo to give 3-chloro-12-cyclohexyl-5-[2-(piperidin-1-yl)ethyl]-5,6,7,12-tetrahydro-benzo[2,3]azepino[4,5-b]indole-9-carboxylic acid (212 mg, yield 72%).

Provenance & Evidence